[#STDCXX-544] [gcc] use __builtin functions

C++ Standard Library

[gcc] use __builtin functions

Created: 06/Sep/07 04:55 PM Updated: 08/Apr/08 05:11 PM

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Component/s:

Build and Installation

Affects Version/s:

4.1.2, 4.1.3, 4.1.4, 4.2.0

Fix Version/s:

4.3.0

Time Tracking:

Issue & Sub-Tasks

Issue Only

Original Estimate:

16h

Remaining Estimate:

14h

Time Spent:

Environment:

gcc

Severity:

Inefficiency

Sub-Tasks:

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Open

~~[gcc] use string __builtins~~

Resolved

Martin Sebor

100%

[gcc] use math __builtins

Open

Martin Sebor

66%

[gcc] use __builtin_prefetch to optimize string

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Gcc provides many built-in equivalents of C library functions like memcpy or strlen for optimization purposes. stdcxx should take advantage of them when possible to deliver better performance.

http://gcc.gnu.org/onlinedocs/gcc-4.1.2/gcc/Other-Builtins.html#Other-Builtins

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Martin Sebor added a comment - 10/Dec/07 06:53 AM

Affects all released versions.
This makes a lot of sense. We should definitely do a review and take advantage of not just the gcc built-ins but of other compilers' as well. It can be done piecemeal, one compiler at a time, and we can probably also roll it out in stages starting with 4.2.1.

Martin Sebor made changes - 10/Dec/07 06:53 AM

Field	Original Value	New Value
Affects Version/s		4.1.2 [ 12310173 ]
Severity		Inefficiency
Affects Version/s		4.1.4 [ 12310693 ]
Affects Version/s		4.2.0 [ 12311945 ]
Fix Version/s		4.2.1 [ 12312690 ]
Summary	use gcc __builtin functions	[gcc] use __builtin functions

Martin Sebor made changes - 23/Jan/08 03:48 AM

Original Estimate		8h [ 28800 ]
Remaining Estimate		8h [ 28800 ]

Martin Sebor made changes - 23/Jan/08 10:12 PM

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Martin Sebor [ sebor ]

Martin Sebor made changes - 13/Feb/08 04:08 PM

Status

Open [ 1 ]

In Progress [ 3 ]

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Martin Sebor added a comment - 08/Apr/08 05:11 PM

Since the subtask STDCXX-722 has just been deferred until 4.3, deferring the parent too.

Martin Sebor made changes - 08/Apr/08 05:11 PM

Fix Version/s	4.2.1 [ 12312690 ]
Fix Version/s		4.3 [ 12312692 ]